Man seen dropping bag is focus of Boston bombing investigation

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A Rosary, left, hangs from a barricade near a Boston Marathon finisher's medal, center,guarded by a Massachusetts National Guard member near a makeshift memorial on Boylston Streetnear the site where a day earlier explosions killed three and injured more than 140 in Boston, Tuesday, April 16, 2013. The bombs that blew up seconds apart at the finish line of one of the world's most storied races left the streets spattered with blood and glass, and gaping questions of who chose to attack at the Boston Marathon and why. (AP Photo/Julio Cortez)